Elevator



m Model.) 2 Sheets-Sheet G. G. TE'WKSBURY- ELEVATOR.

.049. I Patented Mann, 1882.

azzete Jizven/tor 1 UNITED STATES PATENT,

GEORGE O. TEWKSBURY, OF LYNN, MASSACHUSETTS.

ELEVATO R.

SPECIFICATION forming part of Letters Patent No. 255,049, dated March14, 1882.

Application filed October 3, 188].

To all whom it may concern:

Be it known that 1, GEORGE C. TEWKS- BURY, a citizen of the UnitedStates, and resident of Lynn, in the county of Essex and Commonwealth ofMassachusetts, have invented certain new and useful Improvements inElevators, of which the following, in connection with the accompanyingdrawings, is a specification. 1

This invention relates to that class of elevators generallyoperated bypower, and commonly used in buildings for hoisting merchandise from onestory thereof to another; and the objects of my improvements are, first,to provide a more positive and efficient means than heretofore known fortaking up the momentum of the driving-shaft, thereby rendering theelevator more sensitive and obedient to the shipper; second, to affordfacilities for revolving the shipper-rod so as to bring any one of thestopping devices (which are arranged upon said rod) into a givenvertical plane; third, to provide a more positive indicator thanheretofore known for determining the position of the locking devices atthe point where the elevator is intended to stop; and, fourth, toprovide facilities for preventing'the cramping or breaking of thelocking devices in case the elevator should not properly or readilyrespond to the belt-shipping devices. All of these are hereinafter fullydescribed and specifically claimed.

In the accompanying drawings, Figure l is aside elevation of the entiremachine, representing the same in contact with the building. Fig. 2 is aplan of the hoisting mechanism. Fig. 3 is a cross section on line 00 00,Fig. 1. Fig. at is a cross-section on line y y, Fig. 1. Fig. 5 is adetached view of the locking mechanism, and Fig. 6 is a detached view ofthe indicator.

The'elevator-box A, cord B, drum (3, worm D, pulleys E F G, shaft H, andshipping-levers I Jare all constructed and combined as shown, to operatein the usual manner.

Connected with the elbow-lever J is a vertically-reciprocating rod, K,which extends the entire length of the elevator-well. It slides insuitable bearings, L, secured to the wall of the building, and isswiveled to the lever J, so as to admit'the rotary movement referred tohere- (No model.)

inafter. Said rod, to avoid bending, is provided with a link, M, whichis set in the-upper end thereof. The weight of the rod is balanced by acounter-weight, N, attached to a projection from the lever J, as shown.The :rod is also provided with pins a, which are fixed at differentplaces on the rod, and project therefrom in difierent directions, likeso many radii of a circle. Said rod is further provided with smallgear-wheels b, which are fixed thereon between suitable disks, 0, asshown in Fig. 1. By moving this rod upward or downward the drivingbeltsmay be shifted about on the pulleys E F G, as and whenever occasionrequires it, to

start or stop the elevator. This movement of the rod K is effected bymeans of the handles f, which project outward through snitable slots inthe indicators 0. Said handles are fulcrumed on the center pins oftheindicators, as shown in Fig. 4, being allowed to slide vertically aswell as to oscillate there-011. Each handle carries upon one end asegmental gear, h, which meshes into the corresponding smallergear-wheel b, as shown in Fig. 1. With this construction it is possiblebyahorizontal movement of the handle f to effect a partial or a completerevolution of the rod K, so as to bring any one of the pins a into thesame vertical straight line with the dog'm, which is attached to theelevator-box A, as referred to hereinafter.

Each of the indicators 0 consists of a semicylindrical case having acentral horizontal slot, which communicates directly with other verticalslots made and numbered as shown in Fig. 6. Said vertical slotsareconstructed in two rows-one on each side of the horizontal slot-tocorrespond with the two directions in which it is possible to move theshipper-rod K. Each of said rows is provided with as many slots, lessone, as there are stories in the building which contains the elevator,and the slots on one side alternate with those on the other, asshown,'for purposes referred to hereinafter.

The elevator-box is always at rcstso long as the driving-belts remain onthe loose or end pulleys, E G, which is always the case while thehandlesj' are in the horizontal slots of the indicators 0. The elevatoris set in motion by shifting either of the driving-belts onto thetightpnlley F. This may be done by simply pushing the handle up or down(the direction being always contrary to that in which the elevator isintended to move) in either of the vertical slots, thereby moving therod K, as before described.

The pins a arcfixed upon the rod K so that when any one of the same isin a perpendicular line with the dog m, Fig. 1, the handles f will beatthose slots of the indicators, respectively, which correspond in numberwith the story of the building at which the pin so arranged is located.

It must now be evident that when the operator desires to ship theelevator and have it stop at a given point or floor of the building hehas only to turn the handlefintoline with that slot of the indicatorwhose number corresponds with the number of the given floor, and whoseposition is on that side of the horizontal slot opposite to thedirection which the elevator'is to travel in order to reach said floor,and then push the handle up or down, as occasion requires, in the slot.The elevator-box will thereupon begin to move toward said point, andwill continue so to move till the dog m, (which is fixed upon the boxA,) interlocking with the pin a, (which is set upon the rod K at thegiven point,) moves the rod sufficiently to bring the handle f back tothe horizontal slot, at which moment the elevator rests, as aforesaid.The belts are prevented from being carried over so as to ship theelevator in the opposite direction by reason of the handles f coming incontact with the projecting teeth of the indicators 0 hence theirregular arrangement of the vertical slots.

The dog on will be equally effective for stopping the elevator, thoughrigidly fastened to the box A, as shown in Fig. 1; but I prefer (as ameans of preventing breakage in case the elevator should not quicklyrespond to the shipping devices) to construct and arrange the dog asshown in Fig. 5. Itherefore proceed to describe the same, so that othersmay construct and make use thereof. In this arrangement said dog isformed as a tongue, 10, projecting from the lever 11. Said lever isarranged, as shown, in amortise formed in the block 12. Behind the lever11 is asprin g, 13, which serves to push forward the lever so as to keepthe tonguelOprojecting outward, as shown. Said lever is further providedwith a second tongue, 14, which operates upon a pin, 15, as referred tohereinafter.

In operation the block 12 is secured to the side of the elevator-box A,the tongues being allowed to project beyond the edge of the box. The pin15 is secured to the wall of the building, in close proximity to the pina, and in a perpendicular line with the tongue 14. The elevator may thenbe set in motion, as above described. The tongue 10 will engage with thepins to, and reciprocate the shipper-rod K, so as to bring the handles finto the horizontal slots of the indicator 0. At this moment the tongue14, strikes upon the pin 15, (secured to the building, as beforedescribed,) which depresses the lever 11 so as to draw the tongue 10inward away from the pin a and allow the elevator to pass.

To make sure of the elevators stopping promptly at the given point, Ihave devised a mechanism to be used in combination with the drivingmechanism for taking up the momentum thereof, as follows: Upon thedrivingshaft H is a fixed pulley, P, Fig. 3, about which is arranged thebrake-shoe R. Said shoe is held in position by a spring, S, one end ofwhich is attached to the hanger 1", and the other end of which isattached to the movable block t, as shown. Said block t is arranged toslide upon the vertical hanging pin a. It carries the screw-rod a towhich is jointed one end of the toggle-arm b the other end of which isjointed,,as shown, to the angular frame 0 which in turn is fixed tohorizontal lever 1, as shown. With this arrangement it must be evidentthat when the lever I, Fig. 1, is moved in either directionhorizontally, as it must be in order to bring either of thedriving-belts onto the tight pulley F, the effect is to depress thespring S, so as to relieve the pressure of the shoe against the pulley Pand allow the elevator to freely move, while the reverse of thismovement, which always takes place in stopping the elevator, elevatesthe end of the spring and brings the shoe in contact with the pulley P,so as to counteract the momentum thereof and quickly stop theelevator-box.

What I claim is-- 1. The combination of the lever J, pivoted as shown,the pulleys E F G and intermediate belt-shifting devices, the revolubleverticallysliding rod K, having suitable clutch-pins, or, arranged atdifferent points on the rod, to project in different directionstherefrom, the handles f, fulcrumed as shown, and the intermediategearing mechanisms, whereby the rod K may be turned and verticallyreciprocated, substantially as described.

2. The combination of the lever J, pivoted as shown, the pulleysE F Gand intermediate belt-shifting devices, the revoluble verticallyslidingrod K, having clutch-pins a, arranged at different points on the rod, toproject therefrom indifferent directions, substantially as described,the lever-handles f, fulcrumed as shown, the indicators 0, fordetermining the relative position of the clutch-pins a, and theintermediate gearing mechanism, whereby the rod K may be turned,substantially as set forth.

3. In an elevator of substantially the construction described, thecombination of the revoluble vertically-reciprocating rod K, providedwith clutch-pins a, gear-wheels b, and suitable disks, 6, said pins,gears, and disks being arranged upon the rod at different points, withthe pins a projecting therefrom in different directions, substantiallyas described, the centrally pivoted leverhandles f, having toothedplates on one end to mesh with the gears on the rod, and suitableindicating mechanism for locating the relative position of theclutch-pins a, substantially as set forth.

4. The combination, substantially as described, of-the elevator-box A,the detachable block 12, the lever pivoted to the detachable block andprovided with projecting tongues, as shown, and mechanism for pushingforward the lever, so as to keep the tongues in position, substantiallyas described.

5. The combination, with the movable lever on 'the elevator-box, of thestud-pins 15, attached to the Wall of the building, adapted toautomatically engage with the tongue 14 on the lever when the box isreciprocated, so as to throw the tongue 10 on-the lever out ofengagement with the clutch on the rod K, substantially as described.

GEO. O. TEWKSBUBY.

Witnesses:

O. B. TUTTLE, FRANK PEASE.

